Reputation: 121
This question is related to c#.The scenario is that when i click the button the operations like File reading,Data manipulation ,and file dumping are going to be happened.After the completion of each operation i will update the status(i.e,File reading completed,data manipulation completed) in the label which is in UI(FORM-frmTesting)
The button click event is
namespace frmTesting
{
public partial class Form1 : Form
{
private void button1_Click_1(object sender, EventArgs e)
{
class1 l_objClass1 = new class1();
l_objClass1.DoOperation();
}
}
public class class1
{
public int DoOperation()
{
ReadTextFile();
ParsingData();
SaveTextFile();
return 0;
}
private int ReadTextFile()
{
//Read the text File
return 0;
}
private int ParsingData()
{
// Data manipulation
return 0;
}
private int SaveTextFile()
{
// save the file
return 0;
}
}
}
Is it possible by using Delegates and Events....if you have any queries plz revert back me
Upvotes: 1
Views: 360
Reputation: 245519
You'll have to modify class1 to broadcast events that other classes can listen to:
public class class1
{
// Not necessary, but will allow you to add custom EventArgs later
public delegate void StatusChangedEventHandler(object sender, EventArgs e);
public event StatusChangedEventHandler FileRead;
public event StatusChangedEventHandler FileParsed;
public event StatusChangedEventHandler FileSaved;
public int DoOperation()
{
ReadTextFile();
ParsingData();
SaveTextFile();
return 0;
}
private int ReadTextFile()
{
//Read the text File
OnFileRead(EventArgs.Empty);
return 0;
}
private int ParsingData()
{
// Data manipulation
OnFileParsed(EventArgs.Empty);
return 0;
}
private int SaveTextFile()
{
// save the file
OnFileSaved(EventArgs.Empty);
return 0;
}
protected virtual void OnFileRead(EventArgs e)
{
if(FileRead != null)
FileRead(this, e);
}
protected virtual void OnFileParsed(EventArgs e)
{
if(FileParsed != null)
FileParsed(this, e);
}
protected virtual void OnFileSaved(EventArgs e)
{
if(FileSaved != null)
FileSaved(this, e);
}
}
And then have your form listen for those events and change its label appropriately:
public partial class Form1 : Form
{
private void button1_Click_1(object sender, EventArgs e)
{
class1 l_objClass1 = new class1();
l_objClass1.FileRead +=
delegate { lblStatus.Text = "File Read..."; };
l_objClass1.FileParsed +=
delegate { lblStatus.Text = "File Parsed..."; };
l_objClass1.FileSaved +=
delegate { lblStatus.Text = "File Saved..."; };
l_objClass1.DoOperation();
}
}
Upvotes: 2
Reputation: 10834
The short answer is yes. You add events to class1 and add handlers to Form1 with the appropriate logic. Below is a sample of how to do this
public partial class Form1 : Form
{
private void button1_Click_1(object sender, EventArgs e)
{
class1 obj = new class1();
obj.FileReadingComplete += HandleFileReadingComplete;
obj.DataManipulationComplete += HandleDataManipulationComplete;
obj.DoOperation();
obj.FileReadingComplete -= HandleFileReadingComplete;
obj.DataManipulationComplete -= HandleDataManipulationComplete;
}
private void HandleFileReadingComplete(object sender, EventArgs args){
//code here
}
private void HandleDataManipulationComplete(object sender, EventArgs args)
{
//code here
}
}
public class class1
{
public event EventHandler FileReadingComplete;
public event EventHandler DataManipulationComplete;
public int DoOperation()
{
ReadTextFile();
OnFileReadingComplete();
ParsingData();
OnDataManipulationComplete();
SaveTextFile();
return 0;
}
private int ReadTextFile()
{
//Read the text File
return 0;
}
private int ParsingData()
{
// Data manipulation
return 0;
}
private int SaveTextFile()
{
// save the file
return 0;
}
public void OnFileReadingComplete()
{
EventHandler handler = FileReadingComplete;
if (handler != null) {
handler(this, EventArgs.Empty);
}
}
public void OnDataManipulationComplete()
{
EventHandler handler = DataManipulationComplete;
if (handler != null) {
handler(this, EventArgs.Empty);
}
}
}
Upvotes: 0